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Error opening feature class from SDE (which can be opened in another application)Yes I did actually. Strange, I thought I had written the solution here. Since I could read the features in the third party application, the developers at the company that makes said third party app were able to export the data. The data had a unique ID (manually created, not ArcGIS automatic), so we were able to delete the old data entirely from the SDE database, then import the previously exported data and connecting it to it's connected tables using the unique ID.